Add -mtarget-align to common build_flags

See arendst/Tasmota#3678 (comment)
Probably related: #2084 #2008

platformio.ini

@@ -113,13 +113,15 @@ monitor_speed             = 115200
 ; ESP8266_DISABLE_EXTRA4K  - Calls disable_extra4k_at_link_time() from setup
 ;                            to force the linker keep user's stack in user ram.
 ; CONT_STACKSIZE to set the 'cont' (Arduino) stack size. Default = 4096
+; -mtarget-align  see: https://github.com/arendst/Sonoff-Tasmota/issues/3678#issuecomment-419712437
 
 [common]
 board_build.f_cpu         = 80000000L
 build_unflags             =
 build_flags               = -D BUILD_GIT='"${sysenv.TRAVIS_TAG}"'
                    -D NDEBUG
                    -lstdc++ -lsupc++
+                   -mtarget-align
                    -DPIO_FRAMEWORK_ARDUINO_LWIP2_HIGHER_BANDWIDTH
                    -DVTABLES_IN_FLASH